Duolingo English Test Vocabulary: Which Questions Test Words and How to Prepare

The Duolingo English Test (DET) tests vocabulary more directly than most English exams. Read and Select asks you to spot real English words among invented ones, Fill in the Blanks and Read and Complete ask you to finish partly missing words, and the interactive reading and listening sections test words in context. Because many items are short and timed, success depends on fast word recognition, accurate spelling and a solid grasp of word forms, not just knowing meanings.

How the Duolingo English Test works

The DET is an online, computer-adaptive test that you take at home. It takes about an hour, and the difficulty of questions adjusts to your answers as you go. Results are reported on a scale from 10 to 160, along with subscores.

Duolingo updates the test more often than most exam boards. It has added new interactive question types and retired others in recent years. The descriptions below match the question types listed in Duolingo's official materials at the time of writing; before your test, check the official DET website and take the free practice test to see the current version.

Which DET question types test vocabulary?

Vocabulary also affects your writing and speaking tasks, where range and accuracy matter, but the six types above are where weaker vocabulary costs you most directly.

Read and Select: real word or fake word?

You see a series of letter strings and have only a short time to mark which ones are real English words. The invented words are designed to look plausible, following normal English spelling patterns.

Strategies

• Trust instant recognition. If you have to think hard about a word, you probably have not met it often. Mark only the words you genuinely recognize.
• Beware of real parts in fake words. Invented items often combine real prefixes and suffixes (-ish, -ance, con-) with non-existent stems.
• Do not over-select. Marking an invented word as real is an error too, so do not mark every word that merely "looks English".

The best preparation is volume: reading a lot means you have seen many real words many times, so your recognition becomes automatic. A large receptive vocabulary is exactly what this task measures. Our vocabulary size estimator gives a rough sense of where you stand.

Fill in the Blanks and Read and Complete

Both tasks show words with letters missing. In Fill in the Blanks you complete a single word in a sentence. In Read and Complete you restore several words in a paragraph. This is a classic cloze format, and it tests more than meaning: you must spell the word and choose the right form.

Strategies

1. Read the whole sentence first. The meaning of the sentence tells you which word is needed; the given letters confirm it.
2. Use grammar clues. Have long ... needs a past participle (debated). Recent ... followed by suggest needs a plural noun (studies).
3. Choose the right word form. Effect versus affect, exposure versus exposed: knowing the whole word family prevents these errors.
4. Check spelling patterns. Doubling (occurred), -ible versus -able, and silent letters are common traps.

You can create your own practice from any article with the cloze deletion generator.

Interactive Reading and Interactive Listening

Interactive Reading takes you through a passage with several linked tasks. According to Duolingo's materials, these include completing sentences by choosing the best word, completing the passage, highlighting the answer to a question, identifying the main idea and choosing a title. The word-choice tasks are close to the SAT's Words in Context questions: several options are related in meaning, but only one fits the sentence precisely.

Interactive Listening places you in a short conversation, usually in a campus or everyday setting, where you choose the best response at each turn and then write a short summary. Vocabulary matters here in two ways: you must recognize words at natural speed, and the answer options often paraphrase what the speaker said rather than repeating it.

What vocabulary should you study for the DET?

Duolingo does not publish a word list, and because the test is adaptive, the words you meet depend on your level. Three groups give the best return:

Pay special attention to commonly misspelled words, because spelling is tested directly: necessary, environment, accommodate, separate, definitely, government, recommend, occurrence, receive, beginning.

Vocabulary in the DET writing and speaking tasks

The productive tasks, such as writing about a photo, the longer writing sample and the speaking responses, are scored on several features of your language, including the range and appropriateness of your vocabulary. You do not need rare words. You need precise, natural ones used without errors.

The second version uses everyday words (crowded, chatting, relaxed, checking notes), but each one adds specific information. Build a small bank of description words for people, places, feelings and actions, and practice using them in one-minute spoken or written descriptions of random photos.

Common vocabulary mistakes on the DET

• Guessing in Read and Select. Selecting plausible-looking invented words because they contain familiar parts.
• Ignoring grammar in cloze tasks. Writing study when the sentence needs studies or studied.
• Spelling from sound. In Listen and Type, writing what you hear phonetically (enviroment, goverment) instead of the correct spelling.
• Repeating the same words. Using good, bad and very in every response instead of more specific alternatives.

How to build DET vocabulary efficiently

• Read every day. 20 minutes of news, science or general-interest articles does more for Read and Select than any list, because recognition grows with exposure.
• Capture words with their sentences. When you meet an unfamiliar word, save it with the sentence you found it in.
• Test spelling, not just meaning. Review by writing the word from its definition, or by completing it from the first few letters.
• Review on a schedule. Short reviews after a day, a few days and a week work better than one long session. The spaced repetition guide explains why.

If you read in Chrome, Wordie can take care of the capture step: select a word to see its definition and synonyms, save it, and it will be highlighted whenever it appears again on other pages, which adds the repeated encounters that build instant recognition. Recall mode lets you test yourself on what you have saved.

A 4-week DET vocabulary plan

Use the vocabulary goal planner if you have more or less time before your test.

Conclusion

The Duolingo English Test checks vocabulary quickly and directly: recognizing real words, spelling them correctly and choosing the right form and meaning in context. Read widely to build instant recognition, study words with their families and spellings, practice cloze-style tasks, and review on a spaced schedule. Confirm the current question types on Duolingo's official site before test day, since the format continues to evolve.